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Instant liquid phase connection method of alumina ceramics

A technology of instantaneous liquid phase connection and alumina ceramics, which is applied in the field of welding, can solve the problems of insufficient high temperature resistance of joints, and achieve the effect of good high temperature resistance and high joint strength

Active Publication Date: 2022-04-12
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The glass or glass-ceramic connection method has the problem of softening of the glass phase, and the high temperature resistance of the joint is insufficient

Method used

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  • Instant liquid phase connection method of alumina ceramics
  • Instant liquid phase connection method of alumina ceramics
  • Instant liquid phase connection method of alumina ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a method for instant liquid-phase bonding of single-crystal alumina ceramics, which specifically includes the following steps:

[0032] (1) Material preparation: use 400#, 800#, 1200# sandpaper to polish in sequence, and then use diamond polishing paste with a particle size of 2.5 μm and 1.5 μm to polish the single crystal alumina ceramics to be welded. After polishing, the alumina ceramics were ultrasonically cleaned with acetone for 20 minutes, and then dried for later use.

[0033] (2) Solder preparation: The weight percentage of solder is composed of: SrO is 67.4%, Al 2 o 3 was 32.6%. Weigh the oxide raw material according to the above ratio, put it into an agate ball mill jar for ball milling, the ball milling medium is ethanol, the balls are agate balls, the milling speed is 400 rpm, and the ball milling time is 15 hours. Drying after ball milling is completed, adding 1% PVA and 6% alcohol to the mixed powder weight after drying, and un...

Embodiment 2

[0038] This embodiment provides a method for instant liquid-phase bonding of single-crystal alumina ceramics, which specifically includes the following steps:

[0039] (1) Material preparation: use 400#, 800#, 1200# sandpaper to polish in sequence, and then use diamond polishing paste with a particle size of 2.5 μm and 1.5 μm to polish the single crystal alumina ceramics to be welded. After polishing, the alumina ceramics were ultrasonically cleaned with acetone for 20 minutes, and then dried for later use.

[0040] (2) Solder preparation: The weight percentage of solder is composed of: SrO is 67.4%, Al 2 o 3 was 32.6%. Weigh the oxide raw material according to the above ratio, put it into an agate ball mill jar for ball milling, the ball milling medium is ethanol, the balls are agate balls, the milling speed is 400 rpm, and the ball milling time is 15 hours. Drying after ball milling is completed, adding 1% PVA and 6% alcohol to the weight of the mixed powder into the drie...

Embodiment 3

[0045] This embodiment provides a method for instant liquid-phase bonding of single-crystal alumina ceramics, which specifically includes the following steps:

[0046] (1) Material preparation: use 400#, 800#, 1200# sandpaper to polish in sequence, and then use diamond polishing paste with a particle size of 2.5 μm and 1.5 μm to polish the single crystal alumina ceramics to be welded. After polishing, the alumina ceramics were ultrasonically cleaned with acetone for 20 minutes, and then dried for later use.

[0047] (2) Solder preparation: The weight percentage of solder is composed of: SrO is 67.4%, Al 2 o 3 was 32.6%. Weigh the oxide raw material according to the above ratio, put it into an agate ball mill jar for ball milling, the ball milling medium is ethanol, the balls are agate balls, the milling speed is 400 rpm, and the milling time is 10 h. Drying after ball milling is completed, adding 1% PVA and 6% alcohol to the mixed powder weight after drying, and uniformly m...

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Abstract

The invention discloses an instant liquid phase connection method for alumina ceramics, and belongs to the technical field of welding. The method comprises the steps that firstly, the surface of to-be-welded ceramic is ground and polished; the preparation method comprises the following steps: preparing SrO (65-69%)-Al2O3 (31-35%) mixed powder as a welding flux by adopting a ball-milling mixing method, and adding polyvinyl alcohol (PVA) and alcohol into the welding flux to prepare welding flux slurry; coating the surface of the aluminum oxide ceramic to be welded with the solder slurry, and assembling according to a'sandwich 'structure; the assembled sample is put into a muffle furnace to be heated to the temperature above the melting point of the solder, and the sample is cooled to the room temperature after heat preservation is conducted for a certain time. According to the invention, SrO in the solder diffuses into aluminum oxide ceramic to change the components of the solder, so that the solder is subjected to isothermal solidification to form a high-melting-point SrAl2O4 phase. The obtained joint has excellent high temperature resistance, and the use temperature of the joint can exceed the welding temperature of the joint.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for instantaneous liquid phase connection of alumina ceramics. Background technique [0002] Alumina ceramics have many advantages such as high hardness, high strength, high temperature resistance, corrosion resistance, etc., and are widely used in machinery, chemical industry, aerospace and other fields. However, ceramic materials are difficult to machine due to their inherent brittleness. Therefore, in order to construct ceramic components with complex shapes and large sizes, it is often necessary to use connection technology, especially the connection technology for high-temperature applications has become a hot and difficult issue in this field. However, among the existing ceramic joining methods, diffusion welding has higher requirements on the surface finish and roughness of the base metal to be welded, and is not suitable for the connection of components with co...

Claims

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Application Information

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IPC IPC(8): C04B37/00
Inventor 朱巍巍唐木邹豪豪韩英冉旭
Owner CHANGCHUN UNIV OF TECH
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